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Be aware how your voice works. Have you ever pulled the open end of an air filled balloon tight and the air rushes out at a squeal like pitch, then the more you open the balloon, the quieter and lower the pitch gets. This is a literal representation of your vocal chords.
Warm up your voice. Always warm up, as this will improve the quality of your voice and prevent strain or damage to your vocal chords. You can try humming, massaging your jaw, or saying any of these warm up exercises: The lips, the teeth, the tip of the tongue, the tip of the tongue, the teeth, the lips..